Rubber-tire-bead construction



Sept. 4, 1928. 1,682,922

, c. w. MCKONE RUBBER TIRE BEAD CONSTRUCTION Filed July 23, 1924 gwuenko'o air/w how/(M 6W WM Patented Sept. 4, I 1928.

CHARLES w. mexonn, or current, 01:10."

BUBZBER-TIRE BEAD-CONSTRUCTION. 9

Application filed July 23,1924. serial no 727,788."

' The invention relates to' the"'con struction ofthe beads in pneumatic tire casings, and theobject of the improvement is to so shape the hard rubber bead core and. build the When a bead core shaped witha triangu-.

. lar cross section is enveloped with one or more of the outer plies of fabric usuallybuilt in. a tire, the pointed inner angular edge of ioned on the rim of a wheel by the enveloping layer'or layers of fabric, as to tend to spring upward and pinch an inner tube against the angular edge of the opposite bead.

This difiiculty is overcome-by-increasing i the depth of the inner part of the under side of the bead core, to the extent of the V '25 thickness'of enveloping plies of fabric, and

toterminate the enveloping ply or plies of fabric against the annular shoulder thus formed in the under side of the "bead-core.

The modified sectional shape of the bead core, and the termination of the enveloplng.

thereof, brings the pointed angular edge and the inner portion of the beadcore downward very close to the rim ofa wheel upon which the tire may be seated; in which position, the

pointed inner edge of the bead tends to push under Van-inner tube, rather than to-impinge p I 1 upon the mner'andouter'sldes thereof.

the side thereof. I i

The improved construction is illustrated in the accompanying drawings, forming part hereof, in Which- Figurel is a cross section of a tire provided with the improved bead; Fig. 2, a section on an enlarged scale'of 45 one bead portion of the tire; and

a ortion of the improved. bead core.. imilar numerals refer to, similar parts throughout the drawing. '7 7 The tire casing illustrated, is builtup of 5 the bead and the adjacent' bottom side;

thereof are so positioned above and cush-;

ply or plies of fabric at the outer side Fig. 3, a fragmentary perspective viewof a plurality of plies of an fabriqindi'cated at land 2, four pliesbeing shown extended a entirely around the body .of the casing, the

plies ll, being upon the interior of the tire I r and the plies 2-2, surroundingthe same. fi

These plies of cord fabric may be impregnated with rubber composition in the usual manner, and the usual breaker strip 3 maybe provided around the central portion of the same. Upon the outer side of the an cord fabric structure above described, are placed the side walls t'and tread 5., The bead cores to which the invention pertains, are indicated at 6 and are substantially the same asthe beads in common use, Withflfi the exception of the increased depth 7 upon the underside of the bead'which increases 1 the length of the inner-side 8 of the bead ,core and forms the annular shoulder 9 on the lower side of the bead.

A flipper strip 10, of ordinary square woven fabric, may be wrapped entirely around the head in the" usuall manner, the 7 ends thereof being overlapped and extended between the fabriefstrips'. 1--1 {and 22. 775

The innermost strips 1;-1- of fabric are placed" over the inner sideof eachQbead,

terminating at the inner pointed edg r toe .11 of the bead as atl. r

The outer'fabric strips -22 extend around i 30 the outer side of the-bead and'terminateat theishould'ert), as shown at'2', instead of a chafer strip of square Woven fabric '12,

terminating a short distance abovethe bead The increased depth 7 of the inner portion of the bead core'not only strengthens 0. the same, butextends the toe edge thereof 1 downward very close to thebottom of the tirebead proper, without," however, making any change in the external sectional configuration ofthe same; and at the same time, 5

a substantial saving is effected by decreasing the width of the enveloping plies of bead core triangular in cross-section and with its inner face widened to extend the toe of the core and provide a recess on its base face marked by a shoulder therein, certain plies of fabric extending across the inner tending around the outside of the core and.

terminating at said shoulder in the base side i thereof, substantially as set forth. v

Intestimony that I claim the above I have hereunto subscribed my name.

7' CHARLESQW.) 

